Mother Earth is being taken over. But it is not by hostile aliens from space.
Human nature is innate to be selfish. Everything on earth has been abused, manipulated and warped to our convenience.
Think of the rate we use up natural resources, the way our population has exploded, and the state of the world today compared to, say, a century ago. We will be our own undoing one day. We are our own worst enemies.
Or Mother Earth will just spit us out when She has had enough.
Who knows, perhaps other possible living organisms in different parts of the universe would make better use of this blue, brown and green ball. We certainly have not.
So come on aliens, if you are out there, I am sure you can teach us a thing or two.
And Mulder* would love to meet you.
*For anyone who has never watched the X-Files, Fox Mulder was an FBI agent hell bent on proving alien existence, and other paranormal phenomena. But the powers that be always thwarted his efforts. Pity, pity.